Waste trap



A il R. C. K. CHADWICK WASTE TRAP Filed Aug. 18, 19 8 Patented Apr. 23, 1940 WASTE TRAP Richard Charles K. Chadwick, Philadelphia, Pa. Application August. 18-, 1938, Serial No. 225,639

3 Claims. (01. 182-23) My invention relates to waste traps employed in the wastev outlets. of sinks or drains, such as.

the sinks or drains of kitchenspsoda. fountains, bars, and/or-similar establishments where the water passingto. waste usually contains particles. oiyfood or. bits; of other foreign matter which, unless trapped, wouldclogrthe waste discharge pipe.

One. object; of, my invention is, to provide a simple. and. efiicient' structure of few parts and readily and cheaply manufactured, with. removable means. designedv to; entrap. bits of food, particles of dish cloth. and. other foreign matter and, to some extent, grease. that may pass-through the sink. outlet.

'A. further object of my invention is to provide a structure that. maybebuilt up from standard tubular sections of suitable metal, or cast in. a single piece.

These and other features-ofmyinvention are more. fully described.hereinafter; reference being hadto the accompanying drawing, inwhich:

Figure 1 is: a view .of.my improved. sink trap in the; position-off use, with respect to a: sink of usual kitchen type.

Fig. ,2 is asectional elevation of one form of trap. within. the, scope of my invention. I

Fig. 3 isa similar sectional view illustrating modified details of my trap construction, and

Fig; 4315a fragmentary sectionalview' illustrating another modification of the trap construction.

My improved waste trap comprises a suitable shell or casing, indicated generally at II), which may be connected in any suitable or usual manner to the outlet I l of the sink l2. In the present instance I have shown a common type of union connection, indicated at l3. A waste pipe of usual type, indicated at it, may be connected to the shell [0 adjacent the upper end of the same by an elbow fitting I l of usual type.

The form of shell or casing illustrated in section in Fig. 2, comprises a section of tubing or pipe of any suitable metal--brass having some preference-indicated at iii, in the lower end of which an internally threaded ring 16 may be sweated, brazed, or otherwise. secured; such threaded ring receiving a detachable closure member ll, which may have a polygonal extension l'l for the reception of a wrench when it is desired to remove or replace the same.

In the upper end of the shell or casing iii, a cap piece l8 may be mounted; the latter having inwardly depending flanges l8 and I8 at its outer and inner margins. The outer flange l8 may be sweated, brazed, or otherwise secured to theupperendof. the shell. or casing I5, While. the

inner flange lji x may. be. similarly secured to a.

tube;- l9, part of. which dependsv within the. shell or casing and whoseupper end outside the casing receives the. outlet H from the sink. The tube It. may have different diameters at top and-bottom, as indicated, providing a shoulder I 9 which serves: to limit the extent to which. the outlet pipe l=l may enter the same. It is. withinythe scope of my invention to provide these difierent diameters wholly within the tube l-B. The upper end ofthe tube I9 carries an externally threaded ring: 2.01,. which maybe-sweated, brazed, or other wise secured thereto, and this, threaded ring receives the union connection IS, with a suitable packing, indicated: at x, to insure a tight joint,

At the side of the shell or casing. and nearv the upper endof the same, a short tubular section 21 l is attached, and this may be brazed, sweated, or otherwise secured inposition and constitutes the overflow outlet. from the shell or casing l5. The

outer end ofthe tubular sectionv 2:l may carryyan.

externally threaded collar 22,. which may be brazed, sweatedpor otherwise secured thereto, for connection to theelbow M at the-upper end of the waste water pipev M. a

. The tube l9 may depend substantially twothirds of the depth. of theshell or casing. 15; the.

lowerend, being well below the outlet 2-1., soas to provide the desired seal.

Loosely fitting the lower end of the depending tube I9, a foraminous sleeve 25, preferably provided at its lower end with an outturned, diagonally disposed flange 25, which flange substantially fits the inner space of the shell [5 and may rest onthe closure member I1. This sleeve is provided with closely placed apertures of suitable size throughout its entire extent, to form 'a proper strainer and hold back bits of solid matter entrained with the waste water. This sleeve may be of the type illustrated in Fig. 2, or I may employ a similarly shaped straining sleeve of screen wire of suitable size mesh, as shown in Fig. 3.

The form of trap structure illustrated in Fig. 3, may comprise a cast shell or casing I5 with a tubular depending portion internally thereof as indicated at I; the upper end having an extension l90*- externally of the shell or casing for the reception of the outlet pipe H from the sink, which may be connected thereto in the same manner as illustrated in Fig. 2. In this form of the trap structure, the tubular .element I90 may have the same diameter throughout. The outlet 2| is atthe same level as the outlet 2| illustrated in Fig. 2, and may be connected to the waste water pipe M in the same manner. The lower end of the shell l5 may be internally threaded for the reception of the closure member. In this form of my improved trap structure, the foraminous sleeve, indicated at 25*, is shown as constructed of screen wire; being of substantially the same shape or contour as the sleeve 25 illustrated in Fig. 2, with an outturned, diagonally disposed flange 26 which substantially flts the inner space of the shell or casing and may rest on the closure member. It will be understood of course that either form of the foraminous screen may be used with either form of the trap structure.

Both forms of the foraminous screening sleeves are free to slide on the tubular portions I 9 (or I 90). These sleeves serve to strain from the waste water passing from'the sink, bits of solid matter, such as waste food, cofiee grounds, bits of wash cloth, etc., and, to a certain extent, particles of grease which may be entrained with the waste water flowing from the sink. By employing loosely fitting straining sleeves, they have a chance to rise during rush of the waste water and permit the foreign matter to collect beneath the flange of the same so that cleansing is not required too frequently. The lower outturned flange of the straining sleeves prevents particles of solid matter passing up the side walls and escaping to the waste water pipe M.

It may be desirable to have the outturned and diagonally arranged flange of the foraminous sleeve in close engagement with the inner surface of the casing wall and for such purpose the lower end of the casing may be of the shape illustrated in Fig. 4, with an external flange l5 which provides suflicient metal to permit the formation of threads in the same plane as the inner surface of the shell wall to receive the closure member.

When it is desired to clean the trap from accumulated foreign matter, the closure member is removed and then the training sleeve will drop out or may be readily removed, together with all foreign matter collected beneath the same.

After cleansing, the straining sleeve may be returned to place; the closure, member replaced and firmly seated and the trap is ready for further use. By preference, a washers is interposed between the closure member and the lower end '2 of the shell or casing. Y

While I have shown more or less specific embodiments of a particular form of structure, it will be understood that modifications may be made in the details of construction without departing from my invention; all of which is deemed to be within the scope of the appended claims.

I claim: a

1. In a Waste trap, the combination of a shell or casing, a tubular member carried by the upper end of the casing and depending into the same; said tubular member receiving the discharge pipe of a sink and stopping short of the bottom of the casing, an overflow connection for said casing disposed above the lower end of said tubular member; said casing opening at its lower end to its full area, a closure for the lower end of the casing, and a foraminous sleeve disposed within the lower part of the casing through which waste water passes to the overflow connection; said. sleeve being freely slidable on the internally disposed tubular member and-having an enlarged lowerportion, also foraminous, initially resting on saidclo'sure.

2. In the structure set forthin claim l; a foraminous sleeve having an outturned and downwardly flaring apertured flange initially resting on the closure and substantially fitting the inner wall of the casing. 4

3. In a waste trap, the combination of a shell or casing of cylindrical form, a tubular connection carried by the upper end of the casing; said tubular connection receiving the discharge pipe of a sink in its upper end and having its lower end stopping short of the bottom of the casing, means for maintaining a water-tight fit between the waste pipe from the sink and said tubular connection, an overflow outlet for the casing disposed above the lower end of the depending internal tubular connection; said casing opening at its lower end to its full area-,a closure for said lower end, and a perforatedqsleeve freely slidable on the depending tubular connection and having an outtumedand downwardly flaring perforated flange at its lower end initially resting on the casing closure and substantially engaging the inner wall of the casing and forming a strainer for the waste water passing to the over flow connection. 3 

